---
title: HP EliteBook 820 G2
x-toc-enable: true
...

**[PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING](../../news/safety.md),
OR YOU MIGHT BRICK YOUR MACHINE: [SAFETY PRECAUTIONS](../../news/safety.md)**

<div class="specs">
<center>
<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2.jpg" /></span>
<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_lid.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_lid.jpg" /></span>
<br/>
<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_ports1.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_ports1.jpg" /></span>
<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_ports2.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_ports2.jpg" /></span>
<br/>
</center>

| ***Specifications***       |                                                |
|----------------------------|------------------------------------------------|
| **Manufacturer**           | HP                                             |
| **Name**                   | EliteBook 820 G2                               |
| **Variants**               | EliteBook 820 G2                               |
| **Released**               | 2014                                           |
| **Chipset**                | 5th gen (Broadwell, SoC)                       |
| **CPU**                    | Intel i5-5200U, i5-5300U, i7-5500U, i7-5600U   |
| **Graphics**               | Intel HD 5500 graphics (libre initialisation)  |
| **Display**                | 14" 1366x768 or 1920x1080 TFT                  |
| **Memory**                 | Two slots, max 16GB/slot (32GB), DDR3/SODIMM   |
| **Architecture**           | x86_64                                         |
| **EC**                     | SMSC MEC1324 in main boot flash                |
| **Original boot firmware** | HP UEFI firmware                               |
| **Intel ME/AMD PSP**       | Present. Can be disabled with me_cleaner.      |
| **Flash chip**             | SOIC-8 16MiB 128Mbit, 12MiB usable by coreboot |


```
W+: Works without blobs;
N: Doesn't work;
W*: Works with blobs;
U: Untested;
P+: Partially works;
P*: Partially works with blobs
```

| ***Features***                                    |    |
|---------------------------------------------------|----|
| **Internal flashing with original boot firmware** | N  |
| **Display (if Intel GPU)**                        | W+ |
| **Audio**                                         | W+ |
| **RAM Init**                                      | W+ |
| **External output**                               | W+ |
| **Display brightness**                            | W+ |

| ***Payloads supported***  |           |
|---------------------------|-----------|
| **GRUB**                  | Works     |
| **SeaBIOS**               | Works     |
| **SeaBIOS with GRUB**     | Works     |
</div>

Full hardware specifications can be found on HP's own website:

<https://support.hp.com/gb-en/document/c04543492>

Introduction
============

**Unavailable in Libreboot 20231106 or earlier. You must [compile from
source](../build/), or use a release newer than 20231106.**

This is a beastly 12.5" Broadwell machine from HP, the main benefit of which is
greater power efficiency (compared to Ivybridge and Haswell platforms), while
offering similar CPU performance but much higher graphics performance.

Variants exist with either Intel Core i5-5200U, i5-5300U, i7-5500U or
i7-5600U and it comes with a plethora of ports; 3x USB 3.0, DisplayPort (which
can do 4K 60Hz), a VGA port, can be expanded to 32GB RAM, has *3* slots which
can take SSDs (PCIe, M2 and regular SATA), also has a side dock connector (for
a docking station). The screen is eDP type and can be upgraded to 1920x1080.

This is a nice portable machine, with very reasonable performance. Most people
should be very satisfied with it, in daily use. It is widely available in
online market places. This page will tell you how to flash it!

All variants of this mainboard will come with Intel HD 5500 graphics, which has
completely free software initialisation in coreboot, provided by *libgfxinit*.

Build ROM image from source
---------------------------

First, install the build dependencies and initialise git, using the
instructions in [building from source](../build/). Unless you're using a
release after Libreboot 20231106, you *must* use the latest `lbmk.git`.

The build target, when building from source, is thus:

	./mk -b coreboot hp820g2_12mb

NOTE: The actual flash is 16MB, but you must flash only the first 12MB of it.
The ROM images provided by Libreboot are 12MB.

There is a separate 2MB *system* flash that you must *erase*, prior to
installing Libreboot. This, along with Libreboot's modified IFD, bypasses
the security (HP Sure Start) that the vendor put there, allowing you to
use coreboot-based firmware such as Libreboot.

Installation
============

Insert binary files
-------------------

If you're using a release ROM, please ensure that you've inserted extra firmware
required refer to the [guide](../install/ivy_has_common.md) for that. (**failure
to adhere to this advice will result in a bricked machine**)

If you're *building* from source (using lbmk), the steps takes above are done
for you automatically, inserting all of the required files. The above link is
only relevant for *release* images, which lack some of these files.

Set MAC address
---------------

This platform uses an Intel Flash Descriptor, and defines an Intel GbE NVM
region. As such, release/build ROMs will contain the same MAC address. To
change the MAC address, please read [nvmutil documentation](../install/nvmutil.md).

Update an existing Libreboot installation
-----------------

<img class="l" tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_backlit.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_backlit.jpg" /></span>

NOTE: This section only applies if you haven't enabled write protection. You
can otherwise use the external flashing instructions (see below) for both the
initial installation and updates, but for updates you don't need to re-erase
the private flash, if it was already erased.

If you're already running Libreboot, and you don't have flash protection
turned on, [internal flashing](../install/) is possible, but please note:

You must *only* flash the first 12MB, and nothing in the final 4MB of the flash.
This is because the EC firmware is in flash, and we don't touch that during
initial installation or during updates.

Update it like so:

Create a dummy 16MB ROM like so:

```
dd if=/dev/zero of=new.bin bs=16M count=1
```

Then insert your 12MB Libreboot ROM image into the dummy file:

```
dd if=libreboot.rom of=new.bin bs=12M count=1 conv=notrunc
```

The `libreboot.rom` file is the 12MB image from Libreboot. The `new.bin`
file is the Libreboot ROM, padded to 16MB. You will not flash the entire 16MB
file, but flashprog detects a 16MB flash IC. This just makes flashrom not
complain about mismatching ROM/chip size.

NOTE: Libreboot standardises on [flashprog](https://flashprog.org/wiki/Flashprog)
now, as of 27 January 2024, which is a fork of flashrom.

You should flash each region individually:

```
flashprog -p internal --ifd -i gbe -w new.bin --noverify-all
flashprog -p internal --ifd -i bios -w new.bin --noverify-all
flashprog -p internal --ifd -i me -w new.bin --noverify-all
flashprog -p internal --ifd -i ifd -w new.bin --noverify-all
```

NOTE: The `--ifd` option uses the regions defined in the *flashed* IFD, so
they must match the ROM. You can otherwise dump a layout file and use that,
using the instructions below (using `-l layout.txt` instead of `--ifd`).

NOTE: If you already did an installation before, and you don't want to
[change the MAC address](../install/nvmutil.html) stored in the gbe region,
you can skip the gbe/ifd/me regions as above, and flash just the BIOS region.

NOTE: Use of `--ifd` requires flashrom 1.2 or higher. If you have an older
version, or you don't have `--ifd`, you could instead do:

```
ifdtool -f layout.txt libreboot.rom
```

Then, instead of `--ifd` you would use `-l layout.txt`.

ALSO: The `--ifd` option makes flashrom flash regions based on what's in
the *current* flashed IFD.

Flashing Libreboot first time (hardware)
========================================

**PLEASE ENSURE that you dump a copy of both flash ICs (system flash and
private flash). Take two dumps of each, and make sure each has two good hashes.
This is because there are certain files that, while you may not need for a
regular Libreboot installation, may be useful for recovery purposes. You have
been warned!**

This section is relevant to you if you're still running the original HP
firmware. You must [flash externally](../install/spi.md).

Take stock of these further notes, because there are extra steps that you
must take.

HP Sure Start
-------------

There is a 16MB flash and a 2MB flash. Read this page for info:
<https://doc.coreboot.org/mainboard/hp/hp_sure_start.html>

The page makes it seem more complicated than necessary, from a user's point
of view. What you really need to do is just erase the 2MB flash IC, and flash
only the first 12MB of the 16MB flash IC. A photo is shown below. Consult
the [SPI flashing guide](../install/spi.md) and act as if you were flashing,
but leave out `-w libreboot.rom` (don't write an image), and instead
use the `--erase` option, with your clip connected to the private flash (2MB
flash IC).

You might want to dump the private flash first, just in case (use `-r priv.rom`
or whatever filename you want to dump to, and take two dumps, ensuring that
the hashes match). The private (2MB) flash is inaccessible from your OS. The
system stores hashes of the IFD, GbE and a copy of IFD/GbE in private flash,
restoring them if they were modified, but erasing the private flash disables
this security mechanism.

Here is a photo of the board, with the flashes:

![HP 820 G2 flash](https://av.libreboot.org/hp820g2/hp820g2_flash.jpg)

HP bootblock
------------

See: <https://doc.coreboot.org/mainboard/hp/elitebook_820_g2.html?highlight=elitebook>

In this page it talks about HP's own bootblock and EC firmware. These are in
the final 4MB of the flash. You must *not* modify these, because you will brick
your machine unless the IFD is modified;

This is why Libreboot provides 12MB images. The IFD in Libreboot is modified, as
per this coreboot documentation, to make the BIOS region *end* at the last byte
of the first 12MB in flash, bypassing HP's security entirely. In other words,
you can run whatever you want (such as Libreboot) in the first 12MB of flash,
so long as the upper 4MB is untouched and the private 2MB flash has been erased.

With Libreboot's modified IFD, HP's own bootblock is never executed, but the
EC firmware *is*, and must be left alone. You do not to insert it in your
Libreboot ROM because it's already in flash, within that last 4MB.

Flash a ROM image (hardware)
-----------------

**REMOVE all power sources like battery, charger and so on, before doing this.
This is to prevent short circuiting and power surges while flashing.**

For general information, please refer to [25xx NOR flash
instructions](../install/spi.md).

Remove the bottom cover via the latch, and the flashes are accessible.
First, dump both flashes for backup, using the `-r` option (instead of `-w`)
in flashrom. Two dumps of each flash, make sure both dumps match for each chip.

We will assume that your system flash (16MB) dump is named `dump.bin`. This is
the dump of your 16MB flash, containing HP's firmware, including the final
bootblock and EC firmware.

This gives you everything, including the final 4MB. Now insert your new ROM
into a copy of `dump.bin`:

```
cp -R dump.bin new.bin
dd if=libreboot.rom of=new.bin bs=12M count=1 conv=notrunc
```

Flash `new.bin` to system flash (16MB IC) using the `-w` option in flashrom,
and erase the private (2MB) flash IC,
using the `--erase` option (instead of `-w filename.rom`) in flashrom.

In the above example, you replaced the first 12MB of the HP dump with that of
your Libreboot image, but leaving the final 4MB intact which contains the EC
firmware. Libreboot's custom IFD sets everything so that all regions, from
IFD to GbE, ME and then BIOS region, exist within the first 12MB of flash.
This makes the machine boot from the end of the 12MB section, containing the
coreboot bootblock, instead of the HP bootblock (which is never executed but
must remain intact).

It's very important that you *erase* the 2MB flash. Be careful *not* to
erase the system (16MB flash). This is yet another reason why you should keep
a backup of both flash ICs, just in case (dumped using `-r` in flashrom).

![](https://av.libreboot.org/hp820g2/hp820g2.jpg)

![](https://av.libreboot.org/hp820g2/hp820g2_inside.jpg)

And that's all. Refer to other documents on Libreboot's website for how
to handle Linux/BSD systems and generally use your machine.

TPM 2.0 potentially supported
==============================

The onboard TPM is an SLB 9660, which supports TPM 1.2 but it is known to be
compatible with TPM 2.0 via firmware upgrade. Although not yet tested, we have
some notes about that here:

[../../tasks/#hp-820-g2-tpm](../../tasks/#hp-820-g2-tpm)

Not yet used meaningfully by Libreboot itself, but the TPM can be used to
implement things like measured boot.

References
==========

See: <https://doc.coreboot.org/soc/intel/broadwell/blobs.html>

Libreboot's build system automatically pulls down the MRC/refcode files, and
modifies the refcode to enable the onboard Intel Gigabit Ethernet (GbE). You
don't need to mess with this at all, when you build Libreboot yourself.

You can see how this works, by looking at the patch which added 820 G2 support:
<https://browse.libreboot.org/lbmk.git/commit/?id=401c0882aaec059eab62b5ce467d3efbc1472d1f>

If you're using release builds, the MRC, refcode and (neutered) ME images are
missing from flash, and must be re-inserted, using the instructions
on [this page](../install/ivy_has_common.md).
